Antibiotic substance B-41, their production and their use as insecticides and acaricides

ABSTRACT

New antibiotic substances are obtained by culturing a strain belonging to the genus Streptomyces and by recovering said substances from the culture material. The new antibiotic possess insecticidal and acaricidal properties.

RELATED APPLICATIONS

This application is a division of application Ser. No. 394,073, filed Sept. 4, 1973 (now U.S. Pat. No. 3,950,360), which, in turn, is a continuation-in-part if application Ser. No. 365,188, filed May 30, 1973 (abandoned).

Applications Ser. Nos. 519,668, filed Oct. 31, 1974, now U.S. Pat. No. 3,966,914; 569,567, filed Apr. 21, 1975; 573,567, filed May 1, 1975; 604,225, filed Aug. 31, 1975; and 608,895, filed Aug. 29, 1975, are also divisions of said application Ser. No. 394,073.

This invention relates to new antibiotic substances B-41, a process for producing the antibiotic substance B-41 by culturing in a medium a B-41-producing strain belonging to the genus Streptomyces and then recovering the resulting B-41 from the cultured substance, and an insecticidal and acaricidal composition containing novel antibiotic substances B-41 as an active ingredient.

Many organic compounds have heretofore been used as insecticidal and acaricidal preparations. Among antibiotic substances, however, only a few substances have been known to have insecticidal and acaricidal effects. Moreover, they have not been put into practical use yet.

As the result of extensive studies, we have found that a novel antibiotic substance B-41, which is produced by a B-41-146 strain, a new strain belonging to the genus Streptomyces, is not only far higher in acaricidal activity than the organic compounds having acaricidal activities but also is effective for the control of agricultural and horticultural harmful insects such as aphids, larvae of insects of the order Lepidoptera, etc.

The antibiotic substance B-41, which is the 25 active ingredient of the insecticidal and acaricidal composition of the present invention could be separated into 9 kinds of substances; A₁, A₂, A₃, A₄, B₁, B₂, B₃, C₁ and C₂.

Physicochemical properties of these substances are as shown in the following table:

    __________________________________________________________________________                  A.sub.1                                                                              A.sub.2                                                                             A.sub.3                                                                             A.sub.4                                                                             B.sub.1                                                                             B.sub.2                                                                               B.sub.3                                                                             C.sub.1                                                                              C.sub.2               Molecular formula                                                                           C.sub.32 H.sub.48 O.sub.7                                                            C.sub.38 H.sub.56 O.sub.10                                                          C.sub.31 H.sub.44 O.sub.7                                                           C.sub.32 H.sub.46 O.sub.7                                                           C.sub.39 H.sub.58 O.sub.10                                                          C.sub.32 H.sub.46 O.sub.7                                                             C.sub.33 H.sub.48 O.sub.7                                                           C.sub.36 H.sub.47                                                              O.sub.9 N                                                                            C.sub.37                                                                       H.sub.49 O.sub.9                                                               N                     __________________________________________________________________________           C      70.56 67.83                                                                               70.43                                                                               70.82                                                                               68.19                                                                               70.82  71.19                                                                               C: 67.80                                                                             C: 68.18                    Calculated                                   H:  7.43                                                                             H:  7.58              Elementary                                                                           H      8.88  8.39 8.39 8.54 8.51 8.54   8.69 N:  2.20                                                                             N:  2.15              analysis                                                                       (%)                                                                                  C      70.74 71.73                                                                               65.73                                                                               69.85                                                                               68.00                                                                               69.66  70.72                                                                               C: 65.93                                                                             C: 68.09                    Found                                        H:  7.53                                                                             H:  7.54                    H      9.18  8.26 7.89 8.37 8.32 8.32   8.59 N:  2.14                                                                             N:  2.13                    Osmometric                                                               Molecular                                                                            method (in                                                                            513.9 672.1                                                                               517.0                                                                                 -- 629.5                                                                               524.3    --   --20                                                                                 --                  weight                                                                               acetone)                                                                       Mass spect-                                                                           544   672  528  542  686  542    556  679   693                         rum (M+)                                     (Note                                                                                (Note 1)                           Amor- Amor-                                                                               212  193  176  139    Amor-                                                                               Amor- Amor-                 Melting point (° C.)                                                                 phous phous                                                                               -215 -195 -178 -142   phous                                                                               phous phous                              powder                                                                               powder                     powder                                                                              powder                                                                               powder                Specific rotatory                                                              power [α].sub.D.sup.20                                                                +160°                                                                         +54°                                                                         +106°                                                                        +103°                                                                        +75°                                                                         +131°                                                                          +126°                                                                        +57°                                                                          +54°           (Concentration of                                                              sample 5 mg/2 ml,                                                              length of layer in                                                             acetone 10 cm)                                                                 Ultraviolet absorption                                                                      240.5 245  245  245  245  245    245  240   240                   spectrum (λ-max, μ)                                                               FIG. 1                                                                               FIG. 2                                                                              FIG. 3                                                                              FIG. 4                                                                              FIG. 5                                                                              FIG. 6 FIG. 7                                                                              FIG.                                                                                 FIG. 9                Infrared absorption                                                            spectrum (Nujol method)                                                                     FIG. 10                                                                              FIG. 11                                                                             FIG. 12                                                                             FIG. 13                                                                             FIG. 14                                                                             FIG. 15                                                                               FIG. 16                                                                             FIG.                                                                                 FIG. 18               Nuclear magnetic                                                               resonance spectrum                                                                          FIG. 19                                                                              FIG. 20                                                                             FIG. 21                                                                             FIG. 22                                                                             FIG. 23                                                                             FIG. 24                                                                               FIG. 25                                                                             FIG.                                                                                 FIG. 27               [in (CD.sub.3).sub.2 CO in the                                                 case of FIGS. 19 to                                                            25, and in CDCl.sub.3 in                                                       the case of FIGS. 26                                                           and 27; 60 MHz]                                                                Mass spectrum (Main                                                                         544   672  528  542  686  542    556  679   692                   peaks under the con-                                                                        402   181  400  414  414  400    414  568   582                   ditions of 75 eV,                                                                           181   153  181  195  195  181    195  400   414                   ionization room tem-                                                                        153   151  153  167  167  153    167  181   195                   perature 200° C. and                                                                            151  151  151              153   167                   sample temperature                125  151    151  111   111                   120° to 190° C.)                     (Note                                                                                (Note 1)                           Difficulty                                                        Solubility in                                                                               soluble in                                                                             "    "    "    "    "      "    "                         solvents     water;                                                                         easily                                                                         soluble in                                                                     n-hexane,                                                                      benzene,                                                                       acetone,                                                                       ethanol and                                                                    chloroform                                                        Color Iodine/                                                                  reaction                                                                             chloroform                                                                            Yellow                                                                               Yellow                                                                              Yellow                                                                              Yellow                                                                              Yellow                                                                              Yellow Yellow                                                                              Yellow                                                                               Yellow                (according                                                                           Ninhydrin                                                                             Negative                                                                             Negative                                                                            Negative                                                                            Negative                                                                            Negative                                                                            Negative                                                                              Negative                                                                            Negative                                                                             Negative              to thin                                                                        layer Sulfuric                                                                 chromato-                                                                            acid spraying                                                                         Brown Reddish                                                                             Brown                                                                               Brown                                                                               Reddish                                                                             Brown  Brown                                                                               Brown Brown                 graphy)                                                                              with heating purple         purple                                             Potassium                                                                      permanganate                                                                          Yellow                                                                               Yellow                                                                              Yellow                                                                              Yellow                                                                              Yellow                                                                              Yellow Yellow                                                                              Yellow                                                                               Yellow                      solution                                                                 Alcohol solution,                                                                           No pKa at                 No pKa at   No pKa at                   neutralization                                                                              pH ranging                pH ranging  pH ranging                  titration method                                                                            from 2 to                                                                              "    "    "    "  from 2 to                                                                               "  from 2                                                                                 "                                12                        9 (crysta-  12                                                                 llization                                                                      took place                                                                     at about pH                                                                    8.7 to make                                                                    the measure-                                                                   ment impos-                                                                    sible                                   Color of substance                                                                          Colorless                                                                            Colorless                                                                           Colorless                                                                           Colorless                                                                           Colorless                                                                           colorless                                                                             Colorless                                                                           Colorless                                                                            Colorless             __________________________________________________________________________      Note 1: Each mass spectra of C.sub.1 and C.sub.2 were measured with the        acetylated derivative obtained by substitution of CH.sub.3 CO-group for        the hydrogen atom of R.sub.1 in the plane structural formula as shown          below.                                                                   

The accompanying drawings show ultraviolet absorption, infrared absorption and nuclear magnetic resonance spectra of the antibiotic substance B-41, in which FIGS. 1 to 9 show, respectively the ultraviolet absorption spectra of A₁, A₂, A₃, A₄, B₁, B₂, B₃, C₁ and C₂ of the antibiotic substance B-41; FIGS. 10 to 18 show,respectively, the infrared absorption spectra of A₁, A₂, A₃,A₄, B₁, B₂, B₃, C₁ and C₂ of the antibiotic substance B-41; and FIGS. 19 to 27 show, respectively, the nuclear magnetic resonance spectra of A₁, A₂, A₃, A₄, B₂,B₃, C₁ and C₂ of the antibiotic substance B-41.

Further, Rf values of the above-mentioned substances as measured according to thin layer chromatography using a thin layer chromatographic spot film containing a fluorescence reagent (available from Tokyo Kasei Kogyo Co. Ltd: Trade name, "SPOTFILM fluorescent") where as set forth in table shownbelow. The detection was made according to the intensity of fluorescence emitted when each substance was irradiated with ultraviolet rays of 2536 A.

    __________________________________________________________________________     Silica gel F                                                                   __________________________________________________________________________     Solvent                                                                        system                                                                               A.sub.1                                                                            A.sub.2                                                                            A.sub.3                                                                            A.sub.4                                                                            B.sub.1                                                                            B.sub.2                                                                            B.sub.3                                                                            C.sub.1                                                                            C.sub.2                                  __________________________________________________________________________     Acetone/n-                                                                     Hexane                                                                               0.47                                                                               0.32                                                                               0.42                                                                               0.44                                                                               0.47                                                                               0.61                                                                               0.63                                                                               0.22                                                                               0.24                                     (30:70)                                                                        Ethyl                                                                          acetate/                                                                             0.61                                                                               0.62                                                                               0.63                                                                               0.65                                                                               0.79                                                                               0.80                                                                               0.82                                                                               0.45                                                                               0.47                                     Benzene                                                                        (50:50)                                                                        Ethyl                                                                          acetate/                                                                             0.27                                                                               0.35                                                                               0.39                                                                               0.41                                                                               0.75                                                                               0.79                                                                               0.81                                                                               0.12                                                                               0.13                                     Chloroform                                                                     (25:75)                                                                        Acetone/                                                                       Benzene                                                                              0.85                                                                               0.75                                                                               0.77                                                                               0.79                                                                               0.92                                                                               0.92                                                                               0.92                                                                               0.60                                                                               0.63                                     (40:60)                                                                        Acetone/                                                                       Benzene                                                                              0.39                                                                               0.32                                                                               0.39                                                                               0.39                                                                               0.57                                                                               0.51                                                                               0.53                                                                               0.11                                                                               0.13                                     (15:75)                                                                        Ethanol/n-                                                                     Hexane                                                                               0   0   0   0   0   0   0   0   0                                        (2:98)                                                                         __________________________________________________________________________

    __________________________________________________________________________     Alumina F                                                                      Solvent                                                                        system                                                                               A.sub.1                                                                            A.sub.2                                                                            A.sub.3                                                                            A.sub.4                                                                            B.sub.1                                                                            B.sub.2                                                                            B.sub.3                                                                            C.sub.1                                                                            C.sub.2                                  __________________________________________________________________________     Acetone/n-                                                                     Hexane                                                                               0.55                                                                               0.16                                                                               0.32                                                                               0.34                                                                               0.67                                                                               0.92                                                                               0.92                                                                               0   0                                        (30:70)                                                                        Ethyl                                                                          acetate/                                                                             0.56                                                                               0.10                                                                               0.21                                                                               0.23                                                                               0.73                                                                               0.81                                                                               0.83                                                                               0   0                                        Benzene                                                                        (50:50)                                                                        Ethyl                                                                          acetate/                                                                             0.40                                                                               0.10                                                                               0.15                                                                               0.17                                                                               0.63                                                                               0.65                                                                               0.67                                                                               0   0                                        Chloroform                                                                     (25:75)                                                                        Acetone/                                                                       Benzene                                                                              0.27                                                                               0.05                                                                               0.09                                                                               0.11                                                                               0.35                                                                               0.45                                                                               0.47                                                                               0   0                                        (15:75)                                                                        Ethanol/n-                                                                     Hexane                                                                               0.17                                                                               0.03                                                                               0.07                                                                               0.09                                                                               0.20                                                                               0.42                                                                               0.44                                                                               0   0                                        (2:98)                                                                         __________________________________________________________________________

From the above-mentioned physicochemical properties, particularly the high resolution mass spectra, and from the results of X-ray analysis, it has been clarified that A₃, A₄, B₂, B₃, C₁ and C₂ of B-41 have the following plane structural formula: ##SPC1##

    ______________________________________                                         R.sub.1       R.sub.2          R.sub.3                                         ______________________________________                                         A.sub.3 H         CH.sub.3         CH.sub.3                                    A.sub.4 H         CH.sub.3         C.sub.2 H.sub.5                             B.sub.2  CH.sub.3 CH.sub.3         CH.sub.3                                    B.sub.3  CH.sub.3 CH.sub.3         C.sub.2 H.sub.5                             C.sub.1 H                                                                                         ##STR1##        CH.sub.3                                    C.sub.2 H                                                                                         ##STR2##        C.sub.2 H.sub.5                             ______________________________________                                    

Likewise, it has been clarified that A₁ of B-41 has the following plane structural formula: ##SPC2##

The structures of A₂ and B₁ of B-41 are not clear. From the fragmentation of mass spectra, however, it is inferred that they are similar in chemical structure to the above-mentioned substances A₁, A₃, A₄, B₂, B₃, C₁ and C₂.

Since there are no known antibiotic substances having the aforesaid chemical structures and physicochemical properties, it has been clarified that the B-41 of the present invention is a novel antibiotic substance.

The B-41-146 strain of the genus Streptomyces, which produces the antibiotic substance B-41, has such mycological properties as mentioned below.

1. Morphological characteristics:

On most common laboratory media, long, serial mycelium developed from fine branched substrate mycelium and formed whorls with spirals or loops.

Fragmentations of mycelium not observed at early stage.

Spores more or less short warty, 0.6-0.9 × 1.1-1.5 μ, formed in chains with 10-50 conidia.

Relatively short warty extrusions on surfaces of spores.

Sporangia and sclerotia not observed.

2. Cultural characteristics on various media:

i. Sucrose-nitrate agar: Good growth; substrate mycelium colorless; reversepale-brown; aerial mycelium scant, semi-transparent, coriaceous; soluble pigment pale-brown.

ii. Glucose-asparagine agar: Abundant growth; substrate mycelium colorless;reverse pale-brown; aerial mycelium abundant, gray-colored; soluble pigmentpale-brown.

iii. Glycerol-asparagine agar: Abundant growth; substrate mycelium colorless; reverse pale-brown; aerial mycelium white, and on slant, many bright grayish brown dots formed in white background; soluble pigment yellowish gray.

iv. Inorganic salts-starch agar: Abundant growth, substrate mycelium colorless; reverse yellowish gray; aerial mycelium gray, and on slant, many pale yellowish dots formed in gray background; soluble pigment brightolive gray.

v. Tyrosine agar: Abundant growth; substrate mycelium grayish yellow brown;reverse brown; aerial mycelium gray, and on slant, yellowish gray dots formed sometimes in gray background; soluble pigment bright brown.

vi. Nutrient agar: Poor growth; substrate mycelium colorless; reverse pale-brown; aerial mycelium scant, white; soluble pigment not produced.

vii. Yeast extract-malt extract agar: Abundant growth; substrate mycelium grayish yellow brown; reverse yellowish brown; aerial mycelium abundant, gray and on slant, many pale yellow dots formed in gray background; soluble pigment yellow.

viii. Oatmeal agar: Abundant growth; substrate mycelium colorless; reverse olive gray; aerial mycelium gray, and on slant, pale yellow dots formed; soluble pigment pale olive.

3. Physiological characteristics:

i. Growth temperature range: 18°-37° C. Optimum growth temperature: 25°-30° C.

ii. Liquefaction of gelatin: Slow but strongly positive.

iii. Hydrolysis of starch: Strongly positive.

iv. Coagulation of skim milk: Positive (28° C). Peptonization of skim milk: Positive (28° C)

V. melanin formation: Negative.

vi. Reduction of nitrate: Positive.

vii. Utilization of various carbon sources (Pridham and Gottlieb agar) Utilization degree: +++ Raffinose. ++ D-Glucose, D-Fructose, Sucrose, L-Rhamnose, I-Inositol, D-Mannitol. + L-Arabinose, D-Xylose.

From the above characteristics, this strain is most closely related to Streptomyces chattanoogensis (International Journal of Systematic Bacteriology, Vol. 18, No. 2, page 97 (1968)), but differs from B-41-146 strains as follows:

1. The B-41 -146 strain abundantly formed whorl, whereas S.chattanoogensis monopodially branched.

2. The spore surface of the B-41-146 strain in warty, whereas that of S.chattanoogensis is spiny.

3. On yeast-malt extract agar and inorganic saltstarch agar, the B-41-146 strain formed paleyellow dots in gray background, but S.Chattonoogensis not formed.

4. The B-41-146 strain assimilates L-arabinose, D-xylose and I-inositol, whereas S.chattanoogensis does not assimilate these carbon sources.

In view of the above-mentioned 4 differences in mycological properties, we judged that the B-41-146 strain is a new species of the genus Streptomyces. The B-41-146 strain has been deposited at the Research Institute of Industrial Technology of Microorganisms, Agency of IndustrialScience and Technology in Japan, with the deposition number Bikokenkinki No. 1438 and at the U.S. Department of Agriculture, Northern Research Laboratory, Peoria, Ill., with the deposit designation NRRL 5739.

As is well known, actinomycetes tend to cause mutation in the natural worldand by application of such artificial operations as, for example, ultraviolet irradiation, radiation irradiation, chemical treatment, etc. The same is the case with the B-41-146 strain of the present invention. The B-41-146 strain referred to in the present invention includes all suchmutants. That is, in the present invention, all strains which produce the antibiotic substance B-41 and which are not clearly distinguishable from the B-41-146 strain and mutants thereof are included in the B-41-146 strain.

In the process of the present invention, the antibiotic substance B-41 is obtained by culturing the B-41 -146 strain in a proper medium, and then recovering the resulting substance from the medium. The strain may be cultured according to stationary culture but, in case the antibiotic substance is desired to be produced in large quantities, it is most preferable to culture the strain according to liquid culture with aerationand agitation.

As the culture media, there may be used all those which are ordinarily usedfor the culture of strains belonging to the genus Streptomyces. Examples ofsuitable carbon sources include starch, dextrin, glucose, maltose, corn steep liquor and molasses, and examples of suitable nitrogen sources include meat extract, peptone, yeast extract, soybean meal, casein, ammonium sulfate and ammonium nitrate. If necessary, there may be added potassium, calcium, magnesium, iron, copper, zinc, manganese, cobalt and the like inorganic salts, or minor elements.

For recovery of the antibiotic substance B-41 from the broth, there is adopted such a conventional procedure as extraction with an organic solvent in the presence or absence of an absorbent or auxiliary agent. In this case, the cells may be separated by filtration from the broth and then extracted with such organic solvent as methanol or acetone, or the broth may directly be subjected to extraction with such organic solvent aschloroform, ethyl acetate, benzene, n-hexane or cyclohexane.

For purification of an oily crude B-41 obtained by removing the solvent from the extract, there is adopted a known purification procedure such as column chromatography or extraction with solvent.

The present invention is illustrated in detail below with reference to examples, but it is needless to say that the scope of the invention is notlimited to the examples.

In the examples, the activity of the broth was evaluated according to dipping of two-spotted spider mites. That is, kidneybean leaves parasitized with two-spotted spider mites were dipped for 1 minute in a 70% acetone extract of the broth or in an aqueous dilution thereof and then air-dried, and the acaricidal activity after 24 hours was measured todetermine the activity.

EXAMPLE 1

30 Liters of a liquid culture medium (pH of about 7.2) containing 2.0% of glucose, 1.0% of soybean meal and 0.2% of sodium chloride was charged intoa 50 liter-jar fermentor, and then sterilized by heating. The B-41-146 strain was inoculated in the said medium and subjected to aerobic stirringculture under such conditions as a temperature of 28° C., and aeration of 8 liters/min. and an agitation of 250 r.p.m. When the cultivation was continued for 120 hours, the broth came to exhibit a brilliant yellow color. At this stage, the cultivation was discontinued, and the activity was examined. As the result, a 300 times dilution of the broth showed an acaricidal activity of 100%. Subsequently, the cells were separated by filtration from the broth and extracted with acetone, and then the acetone was removed by distillation to obtain 44 g. of a brown substance. This substance was extracted with hot hexane, and then the hexane was removed by distillation. The residue was dissolved in a small amount of methanol, and the resulting solution was allowed to stand overnight at -20° C. to deposit precipitates, which were then removed. Thereafter, the methanol was removed by distillation to obtain 35g. of a brown oily substance. The thus obtained oily substance was subjected to alumina column chromatography and eluted with chloroform, effective fractions were collected according to acaricidal activity, and then the chloroform was concentrated. This operation was repeated several times to obtain 8.2 g. of a crude substance. The acaricidal activity of the crude substance was 100% when used at a concentration of 2 μg/ml.

The crude substance was passed through a column packed with "Sephadex LH-20" (trade name for a product of Pharmacia Co.) and eluted with methanol, whereby A₂ c B₁, B₂, A₃, and A₁, which are the main component of B-41, were eluted in this order. However, these substances had overlapped with each other and hence were separately recovered in the form of 2 groups of B₁ +A₂ and B₂ +A₁ +A₃. The B₁ +A₂ group was subjected to silica gel column chromatography and then eluted with chloroform-ethyl acetate to obtain 210mg. of B₁ and 115 mg. of A₂, and the B₂ +A₁ +A₃ group was subjected to silica gel column chromatography to obtain 200 mg. of B₂ and 30 mg. of B₃, which was similar to B₂. Subsequently, the remaining A₁ +A₃ group was subjected to alumina column chromatography to obtain 372 mg. of A₁, 42 mg. of A₃ and 15 mg. of A₄, which was similar to A₃. Further, the alumina column, through which the aforesaid brown oily substance had been passed, was repeatedly subjected several times to methanol elution and silica gel column chromatography to obtain 78 mg. of C₁ of B-41 and 52 mg. of C₂ of B-41.

For preparation of the insecticidal and acaricidal composition of the present invention, one or more of the thus obtained substances A₁, A₂, A₃, A₄, B₁, B₂, B₃, C₁ and C₂ of B-41 are diluted with a carrier and, if necessary, incorporated with other auxiliary agents, whereby the said substances can be formulated intoany of dusts, granules, fine granules, wettable powders, emulsifiable concentrates, oil sprays, etc. It is needless to say that the purificationmay be discontinued at an optional stage of purification and the resulting,crude substance, which has not completely been purified, may be used as theactive ingredient. In case such crude substance is desired to be used as itis as the active ingredient, it is sufficient that the crude substance is purified so as to attain an acaricidal activity of 100% at the concentration of 5 p.p.m. In this case, the content of B-41 in the crude substance is about 50%, and the remainders are impurities from the broth. The carrier referred to herein means a synthetic or natural inorganic or organic substance which is added to an insecticide in order to make the active ingredient thereof easy to reach the objectives such as plants, mites, harmful insects, etc., or to facilitate the storage, transportationor handling of the active ingredient.

Examples of suitable solid carriers include inorganic substances such as clay, talc, diatomaceous earth, kaolin, bentonite, calcium carbonate and synthetic calcium silicate; natural and synthetic resins such as coumaroneresins, alkyd resins and polyvinyl chloride; waxes such as carnauba wax andparaffin wax; shells of nuts such as walnuts and coconuts; and soybean flour.

Examples of suitable liquid carriers include water; alcohols such as ethanol, isopropanol and ethylene glycol; glycol ethers such as ethylene glycol monophenyl ether, and diethylene glycol monoethyl ether; ketones such as acetone, methyl isobutyl ketone, cyclohexanone, acetophenone and isophorone; ethers such as tetrahydrofuran and dioxane; aromatic hydrocarbons such as benzene, toluene, exylene and methyl naphthalene; chlorinated hydrocarbons such as trichloroethylene and carbon tetrachloride; and low, medium and high boling petroleum fractions containing kerosine, light oils or aromatic hydrocarbons.

Examples of suitable propellants include Freon gases, liquefied petroleum gases, methyl ether and vinyl chloride monomers.

For emulsifying, dispersing, wetting or spreading, there is used a surface active agent, which may be ionic or nonionic. Examples of suitable anionicsurface active agents include sodium and calcium salts of lignosulfonic acid, sodium and potassium salts of oleic acid, sodium salt of laurylsulfonic acid, and sodium and clacium salts of dodecylbenzenesulfonic acid. Examples of suitable cationic surface active agents include higher aliphatic amines and ethylene oxide condensates of higher aliphatic amines. Examples of suitable nonionic surface active agents include glycerides of fatty acids, sucrose esters of fatty acids, ethylene oxide condensates of higher aliphatic alcohols, ethylene oxide condensates of higher fatty acids, ethylene oxide condensates of alkyl phenols and alkyl naphthols, and copolymers of ethylene oxide with propylene oxide.

The insecticidal and acaricidal composition of the present invention may contain a protective colloid agent such as gelatin, gum arabic, casein, polyvinyl alcohol or carboxymethyl cellulose, or a thixotropy agent such as sodium polyphosphate or bentonite. The composition of the present invention may further contain other compound having insecticidal and acaricidal activities such as, for example, 2-(1-methylpropyl)-4,6-dinitrophenyl-β,β-dimethyl acrylate, di-(p-chlorophenyl)-cyclopropylcarbinol, N'-(2-methyl-4-chlorophenyl)-N,N-dimethylformamidine, 2,4,4',5-tetrachlorodiphenylsulfone, 1,1-bis(p-chlorophenyl)-2,2,2-trichloroethanol, 0,0-diethyl-S-(2-ethylthio)ethyl phosphorodithioate, 0,0-dimethyl-S-(N-methyl-N-formylcarbamoylmethyl)phosphorodithioate, 2-sec-butylphenyl-N-methylcarbamate or m-tolyl-N-methylcarbamate, or a mineral oil, whereby the effects of the composition are more increased and, in some cases, synergistic effects may be expected. It is needless tosay that the composition of the present invention may be used in admixture with any of fugicides, herbicides, plant growth regulators, attractants, fertilizers, etc.

Effects of the insecticidal and acaricidal compositions of the present invention are explained below with reference to test examples.

TEST EXAMPLE 1

Each of emulsifiable concentrates containing 20% of each of A₁, A₂, A₃, A₄, B₁, B₂, B₃, C₁ and C₂ of B-41, which had been isolated according to the same procedure as in Example, 1, was diluted to a given concentration to prepare a chemical solution. Kidneybean leaves infested with two-spotted spider mites were dipped for 1 minute in the avove-mentioned chemical solution and then air-dried, and the acaricidal activity (%) after 24 hours was calculated. The results obtained were as set forth in the following table:

    __________________________________________________________________________          Concentration                                                                  (p.p.m.)                                                                  Fraction                                                                            20      10   5    2.5  1.25 0.63 0.31 0.16 0.08 0.04                      __________________________________________________________________________     A.sub.1      100  100  100  19.9 0                                             A.sub.2      100  100  100  67.6 0                                             A.sub.3      100  100  100  100  100  100  100  98.2 100  15.2                 A.sub.4      100  100  100  100  100  100  100  100  100  21.3                 B.sub.1      98.1 81.5 69.2 20.0 0                                             B.sub.2      100  100  100  100  100  100  80.5 16.6 0                         B.sub.3      100  100  100  100  100  100  100  74.1 16.3 0                    C.sub.1      100  100  100  100  100  100  100  100  100  51.8                 C.sub.2      100  100  100  100  100  100  100  100  100  97.3                 Reference*   100  56.4 0                                                       __________________________________________________________________________     *1,1-Bis-(p-chlorophenyl)-2,2,2-trichloroethanol (trade name, "Kelthane") 

Text Example 2

An emulsifiable concentrate containing 20% of a of a crude B-41, which had been obtained by purifying 2 times according to alumina column chromatography the brown oily substance prepared in Example 1, was dilutedto a given concentration to prepare a chemical solution. This chemical solution was sprayed to apple leaves infested with about 100 European red mites and, 5 days thereafter, the number of living mites was counted. The results obtained were as set forth in the following table:

    ______________________________________                                                      200 p.p.m.                                                                             100 p.p.m.                                                                               50 p.p.m.                                       ______________________________________                                         Crude B-41     5/108     14/121    50/115                                      Reference (kelthane)                                                                          0.97       8/103    56/128                                      Non-treated              88/102                                                ______________________________________                                    

(The numerator shows the number of mites before spraying, and the denominator shows the number of living mites at the time of counting.)

Test Example 3

Each of emulsifiable concentrates containing 20% of each of a crude B-41 [which had been obtained by purifying according to silica gel column chromatography the brown oily substance prepared in Example 1] and a crudeA₁ +A₂ +A₃ mixture [which had been obtained by subjecting the said crude B-41 to column chromatography using a mixed solvent comprising ethyl acetate and benzene (50:50)] was diluted to a given concentration to prepare a chemical solution. This chemical solution was sprayed to orange leaves infested with citrus red mites, and the acaricidal activity (%) after 24 hours was calculated. The results obtained were as set forth in the following table:

    ______________________________________                                                   20 p.p.m.                                                                             10 p.p.m.                                                                               7 p.p.m. 3.3 p.p.m.                                  ______________________________________                                         Crude B-41           100%            85.5%                                     Crude A.sub.1 +A.sub.2 +A.sub.3                                                mixture              100             100                                       Reference                                                                      (Kelthane)  90.9              30.8                                             ______________________________________                                    

Test Example 4

Each of emulsifiable concentrates containing 20% of each of a crude A₁ +B₁ mixture B-41 [which had been obtained by purifying 3 times according to silica gel chromatography (n-hexane:acetone = 70:30) the brown oily substance prepared in Example 1] and a crude A₂ +A₃ +B₂ mixture of B-41 [which had been obtained in the same manner as the former] was diluted to a given concentration to prepare a chemical solution. This chemical solution was sprayed to Chinese cabbages infested with green peach aphids, and the morality (%) of the aphids after 24 hourswas calculated. The results obtained were as set forth in the following table:

    ______________________________________                                                      250 p.p.m.                                                                             25 p.p.m. 2.5 p.p.m.                                      ______________________________________                                         Crude A.sub.1 +B.sub.1 mixture                                                                 100%      92.3%     64.2%                                      Crude A.sub.2 +A.sub.3 +B.sub.2 mixture                                                       100       89.8      52.8                                        Reference**    100       73.1      33.1                                        ______________________________________                                         **0,0-Dimethyl-0-(2,2-dichlorovinyl)phosphate                             

Test Example 5

Eggs of rice stem borer of 1st generation were inoculated to rice plants (variety "Kinmaze"), which had been planted in 200 cm² pots, and werehatched to allow the larvae invade the stems. Subsequently, a wettable powder containing 40% of a crude B-41, which had been obtained by purifying 2 times according to alumina column chromatography the brown oily substance prepared in Example 1, was diluted to a given concentrationand then sprayed to the plants in a proportion of 100 cc. per pot. 5 Days thereafter, the stems were split to examine the alive and dead of the larvae, and the mortality (%) of the larvae was calculated. The results obtained were as set forth in the following table:

    ______________________________________                                                      100 p.p.m.                                                                              50 p.p.m.                                                ______________________________________                                         Crude B-41     100%       79.4%                                                Reference***   82.1       25.5                                                 ______________________________________                                         ***0,0-Diethyl-0-(2-isopropyl-4-methyl-6-pyrimidinyl)phosphorothioate     

As seen in Test Examples 1 to 5, the antibiotic substance B-41 is excellentin insecticidal and acaricidal activity, and has far more prominent effectsparticularly on mites than the conventional chemicals.

Procedures for preparing the insecticidal and acaricidal compositions of the present invention are shown below with reference to preparation examples, in which all parts are by weight.

Preparation Example 1

10 Parts of a crude B-41, which had been obtained by purifying 2 times according to silica gel column chromatography the brown oily substance prepared in Example 1, was homogeneously mixed with 5 parts of white carbon, 50 parts of talc and 35 parts of clay. The resulting mixture was pulverized 3 times by means of an impact type pulverizer and again homogenized to obtain a dust.

Preparation Example 2

40 Parts of the same crude B-41 as in Preparation Example 1 was homogeneously mixed with 20 parts of white carbon, 5 parts of sodium dodecylbenzenesulfonate, 2 parts of polyvinyl alcohol and 33 parts of clay. The resulting mixture was pulverized 3 times by means of an impact type pulverizer and again homogenized to obtain a wettable powder.

Preparation Example 3

20 Parts of the same crude B-41 as in Preparation Example 1 was homogeneously mixed with 7 parts of polyoxyethylene nonylphenyl ether, 3 parts of calcium dodecylbenzenesulfonate and 70 parts of xylene, and the resulting mixture was filtered to obtain an emulsifiable concentrate.

Preparation Example 4

10 Parts of the same crude B-41 as in Preparation Example 1 was dissolved in 10 parts of xylene. The resulting solution was mixed with 80 parts of machine oil and then filtered to obtain an oil spray. 

What we claim is:
 1. An agricultural acaricidal composition containing an acaricidally effective amount of an antibiotic substance having the formula ##SPC3##wherein R₁ represents a hydrogen atom or methyl, R₂ represents methyl, and R₃ represents methyl or ethyl; and an agriculturally acceptable carrier.
 2. The composition of claim 1, wherein R₁ is hydrogen.
 3. The composition of claim 1, wherein R₁ is methyl.
 4. The composition of claim 1, wherein R₃ is methyl.
 5. The composition of claim 1, wherein R₃ is ethyl.
 6. An agricultural insecticidal composition containing an insecticidally effective amount of an antibiotic substance having the formula ##SPC4##wherein R₁ represents a hydrogen atom or methyl, R₂ represents methyl, and R₃ represents methyl or ethyl, and an agriculturally acceptable carrier.
 7. The composition of claim 6, wherein R₁ is hydrogen.
 8. The composition of claim 6, wherein R₁ is methyl.
 9. The composition of claim 6, wherein R₃ is methyl.
 10. The composition of claim 6, wherein R₃ is ethyl. 